Dentoglobigerina tripartita


Classification: pf_cenozoic -> Globigerinidae -> Dentoglobigerina -> Dentoglobigerina tripartita
Sister taxa: D. juxtabinaiensis, D. binaiensis, D. sellii, D. tapuriensis, D. baroemoenensis, D. larmeui, D. galavisi, D. altispira, D. globosa, D. globularis, D. prasaepis, D. pseudovenezuelana, D. taci, D. tripartita, D. eotripartita, D. venezuelana, D. sp.,

Taxonomy

Citation: Dentoglobigerina tripartita (Koch 1926)
Rank: Species
Basionym: Globigerina bulloides tripartita
Synonyms:
Taxonomic discussion:

This is a very common species that can dominate assemblages, especially in the upper Oligocene, and it also persists well into the Miocene. Its evolution seems to have involved gradual development of more compact spherical forms, at times having even fewer than three whole chambers in the final whorl, and there is also an increasingly frequent occurrence of a small, cap-like final chamber.

When the Atlas of Eocene Planktonic Foraminifera was published, we had been unable to obtain SEMs of the holotype of Globigerina tripartita Koch, and we based our concept on the re-illustration provided by Blow and Banner (1962) and the concept developed by Blow and Banner (1962), Blow (1969) and Blow (1979) from their studies of material from the upper Eocene of Tanzania. Here we provide new SEMs of the holotype for the first time which reveal a robust, sub-spherical form, as is typical in particular of upper Oligocene assemblages, which contrasts with the smaller, more gracile forms described by Blow and Banner (1962) and various other authors up to Olsson and others (2006) from the Eocene. In this study we follow Pearson and Wade (2015) in regarding those forms as distinct, and we name a new species, D. eotripartita, to accommodate them (see discussion under that species). Our revised concept of the true tripartita is exemplified by specimens previously illustrated by Brönnimann and Resig (1971), Quilty (1976), and Leckie and others (1993) from a variety of deep sea drill sites.

Bolli (1957) named Globigerina rohri from the opima Zone of Trinidad, but seems to have been unaware of the previously described Globigerina tripartita Koch. Blow and Banner (1962) re-studied and re-illustrated the holotype of tripartita and proposed that it was a senior synonym of rohri (see also Blow, 1969, 1979), which was followed by Stainforth and others (1975) and most other authors and seems also to have been accepted by Bolli (see Bolli and Saunders, 1985, in which rohri is not mentioned). However, Spezzaferri and Premoli Silva (1991:248) and Spezzaferri (1994) recognized tripartita and rohri as distinct taxa.

Blow and Banner (1962) described Globoquadrina dehiscens praedehiscens from the upper Oligocene of Trinidad, arguing that the morphology was the direct ancestor of Globoquadrina dehiscens. Blow (1969) illustrated another adult specimen and the internal morphology of two dissected specimens, revealing what he called the “Globigerina tripartita early stage” (Blow, 1969, caption to pl. 29). We would now regard this as a “Dentoglobigerina eotripartita” early stage. In our view, this interesting observation supports the evolutionary relationship between eotripartita and tripartita, and indicates that the eotripartita morphology likely persists as a juvenile into the uppermost Oligocene. Whereas most authors to date have accepted the notion of an evolutionary lineage from praedehiscens to dehiscens, others (e.g., Fleisher, 1974, and Stainforth and others, 1975) have disagreed, regarding praedehiscens as a variant of tripartita (see also discussion in Iaccarino, 1985). Pearson and Wade (2009) examined new specimens from very close to the type locality of praedehiscens and placed it in questionable synonymy with tripartita.

As part of our study we have examined the type specimens of all three of these historically important species and obtained new SEMs (compared on Plate 11.14). Although one can recognize minor differences between the specimens (e.g., rohri is somewhat more spherical, and praedehiscens has a more obvious umbilical tooth) such variability is within the normal bounds of populations. Moreover, there is little difference in the reported stratigraphic ranges of the three taxa. Hence we here regard them as synonyms, with tripartita having seniority. In our investigations we have found no evidence that tripartita (=praedehiscens) is ancestral to dehiscens. Instead, we describe morphological intermediates between Dentoglobigerina larmeui and Globoquadrina dehiscens (see discussion under those taxa), the latter taxa forming a separate but morphologically similar subclade in the dentoglobigerinid tree (Figure 11.1).

Globigerina sakitoensis Asano was described from the Oligocene of Japan. Blow (1969) and (1979) considered this form to be synonymous with Dentoglobigerina sellii and Dentoglobigerina tapuriensis, respectively. Although we have not obtained new holotype images of this species, based on the original drawings and description, we considered this form to be a junior synonym of Dentoglobigerina tripartita. Globigerina sastrii Raju is a rather extreme, almost bilobate form that we also include here in synonymy. [Wade et al. 2018]

Catalog entries: Globigerina bulloides tripartita;
Globigerina rohri;
Globoquadrina dehiscens praedehiscens;

Type images:

Distinguishing features: Test compact, subcircular to subquadrate; cap-like final chamber extends over umbilicus.
Aperture umbilically centered; with an irregular, subtriangular lip.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters:

Dentoglobigerina tripartita is distinguished from D. eotripartita by its larger and more robust, sub-spherical morphology. It is distinguished from D. sellii by the more compressed and reniform final chambers, and in lacking the large inflated final chamber typical of the sellii species. [Wade et al. 2018]


Wall type: Cancellate, probably spinose in life, pustulose, with concentrations of pustules on the umbilical shoulders. [Wade et al. 2018]

Test morphology: Large, robust, globular, sub-spherical, outline sub-circular; in spiral view 3 embracing, elliptical shaped chambers, arranged in a moderate trochospire, that rapidly increase in size in final whorl, ultimate chamber may be reduced in size; in edge view globular, sub-circular in outline; in umbilical view 3 embracing chambers in final whorl that rapidly increase in size, final chamber commonly reduced in size, somewhat reniform, umbilicus small, triangular, open, aperture umbilical bordered by an irregular triangular shaped tooth covered in small pustules. [Wade et al. 2018]

Size: Maximum diameter of holotype 0.52 mm, minimum diameter 0.50 mm. [Wade et al. 2018]

Biogeography and Palaeobiology


Geographic distribution: Cosmopolitan; it is common in the tropics and Miocene examples have been found up to 63oN at DSDP Site 407 (Poore, 1979). [Wade et al. 2018]

Isotope paleobiology: Oligocene specimens from ODP Hole 758A registered among the most positive δ18O of planktonic assemblages indicating a deep habitat, although earliest Oligocene specimens may have had a shallower water preference (van Eijden and Ganssen, 1995). [Wade et al. 2018]

Phylogenetic relations: Dentoglobigerina tripartita evolved from D. eotripartita n. sp. in the early Oligocene. [Wade et al. 2018]

Most likely ancestor: Dentoglobigerina eotripartita - at confidence level 3 (out of 5). Data source: Wade et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: This species has a distinct acme in the upper Oligocene. The oldest figured specimen we assign to this species is from lower Oligocene Zone O2 of DSDP Site 313, where the range is reported to extend intermittently down into the upper part of Zone O1 (Fleisher, 1975). We have observed tripartita sensu stricto appearing in the middle part of Zone O1 at IODP Site U1334 (B.S. Wade, unpublished data). The reported highest occurrence is variable, possibly because of varying species concepts. At IODP Sites U1337 and U1338 in the equatorial Pacific Ocean it is common to the top of Subzone M5b, and then infrequent until middle Miocene Zone M10/M11 (Pälike and others, 2010). The youngest figured specimen is from Zone M7 (Fox and Wade, 2013). [Wade et al. 2018]
Last occurrence (top): within M7 zone (13.77-14.24Ma, top in Serravallian stage). Data source: Wade et al. 2018 (tentative)
First occurrence (base): within O1 zone (32.10-33.90Ma, base in Priabonian stage). Data source: Wade et al. 2018

Plot of occurrence data:

Primary source for this page: Wade et al. 2018 - Olig Atlas chap.11 p.368; Olsson et al. 2006 - Eocene Atlas, chap. 13, p. 408

References:

Asano, K., (1962). Tertiary Globigerinids from Kyushu, Japan. Science Reports of the Tohuku University, Series 2 (Geology), Special Volume, 5: 49-65.

Berggren, W.A.; Aubry, M.-P. & Hamilton, N., (1983). Neogene magnetobiostratigraphy of DSDP Site 516, Rio Grande Rise (South Atlantic). Initial Reports of the Deep Sea Drilling Project, 72: 675-713.

Blow, W.H. & Banner, F.T., (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In: Eames, F.E. et al. (Editors), Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge, pp. 61-151.

Blow, W.H., (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology, 39(178): 67-251.

Blow, W.H., (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In: Bronnimann, P. and Renz, H.H. (Editors), Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967, Leiden, Netherlands, pp. 380-381.

Blow, W.H., (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea), 2. E. J. Brill, Leiden, 1413 pp.

Bolli, H.M. & Saunders, J.B., (1985). Oligocene to Holocene low latitude planktic foraminifera. In: Bolli, H.M., Saunders, J.B. and Perch-Neilsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, UK, pp. 155-262.

Bolli, H.M., (1957). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, DC, pp. 97-123.

Borsetti, A.M., (1959). Tre nuovo Foraminiferi plactonici dell'Oligocene Piacentino. Giornale di Geologia Series 2, 27: 205-212.

Brönnimann, P. & Resig, J., (1971). A Neogene globigerinacean biochronologic time-scale of the southwestern Pacific. Deep Sea Drilling Project, 7(2): 1235-1469.

Fleisher, R.L., (1974). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project, 23: 1001-1072.

Fleisher, R., (1975). Oligocene planktonic foraminiferal biostratigraphy, central North Pacific Ocean, DSDP Leg 32. Initial Reports of the Deep Sea Drilling Project, 32: 753-763.

Fox, L.R. & Wade, B.S., (2013). Systematic taxonomy of early–middle Miocene planktonic foraminifera from the equatorial Pacific Ocean: Integrated Ocean Drilling Program, Site U1338. Journal of Foraminiferal Research, 43: 374-405.

Iaccarino, S., (1985). Mediterranean Miocene and Pliocene planktic foraminifea. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambrige University Press, Cambrige, pp. 283-314.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Koch, R., (1926). Mitteltertiare Foraminiferen aus Bulongan, Ost-Borneo. Eclogae Geologicae Helvetiae, 19: 207-213.

Leckie, R.M.; Farnham, C. & Schmidt, M.G., (1993). Oligocene planktonic foraminifer biostratigraphy of Hole 803D (Ontong Java Plateau) and Hole 628A (Little Bahama Bank), and comparison with the southern high latitudes. In: Berger, W.H., Kroenke, L.W. and al., e. (Editors), Proceedings of the Ocean Drilling Program, Scientific Results. Ocean Drilling Program, College Station, Texas, pp. 113-136.

Li, Q.; Jian, Z. & Su, X., (2005). Late Oligocene rapid transformations in the South China Sea. Marine Micropaleontology, 54: 5-25.

Olsson, R.K.; Hemleben, C. & Pearson, P.N., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Dentoglobigerina. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Cushman Foundation Special Publication. 41 Allen Press, Lawrence, Kansas, pp. 401-412.

Pearson, P.N. & Wade, B.S., (2009). Taxonomy and stable isotope paleoecology of well-preserved planktonic foraminifera from the uppermost Oligocene of Trinidad. Journal of Foraminiferal Research, 39: 191-217.

Pearson, P.N. & Wade, B.S., (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation Special Publication, 45: 1-85.

Poore, R.Z., (1979). Oligocene through quarternary planktonic foraminiferal biostratigraphy of the North Atlantic: DSDP LEG 49. Initial Reports of the Deep Sea Drilling Project, 49: 447-517.

Postuma, J.A., (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague, 406 pp.

Pälike, H.; Nishi, H.; Lyle, M.; Raffi, I.; Gamage, K.; Klaus, A. & Scientists., E., (2010). Expedition 320/321 summary. Proceedings of the Integrated Ocean Drilling Program, 320/321: 1-141.

Quilty, P.G., (1976). Planktonic foraminifera DSDP Leg 34, Nazca Plate. Initial Reports of the Deep Sea Drilling Project, 34: 629-703.

Raju, D.S.N., (1971). Upper Eocene to Early Miocene planktonic foraminifera from the subsurface sediments in Cauvery Basin, India. Jahrbuch der Geologischen Bundesanstalt, Sonderband, 17: 7-68.

Spezzaferri, S. & Premoli Silva, I., (1991). Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico. Palaeogeography, Palaeoclimatology, Palaeoecology, 83: 217-263.

Spezzaferri, S., (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica, 81: 1-187.

Stainforth, R.M.; Lamb, J.L.; Luterbacher, H.; Beard, J.H. & Jeffords, R.M., (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. The University of Kansas Paleontological Contributions, 62: 1-425.

van Eijden, A.J.M. & Ganssen, G.M., (1995). An Oligocene multi-species foraminiferal oxygen and carbon isotope record from ODP Hole 758A (Indian Ocean): paleoceanographic and paleo-ecologic implications. Marine Micropaleontology, 25: 47-65.

Wade, B.S.; Pearson, P.N.; Olsson, R.K.; Fraass, A.J.; Leckie, R.M. & Hemleben, C., (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Dentoglobigerina and Globoquadrina. In: Wade, B.S. et al. (Editors), Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research Special Pulbication. 46, pp. 331-385.


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Dentoglobigerina tripartita compiled by the pforams@mikrotax project team viewed: 18-9-2018

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